PHPのランダムな文字

随机文字生成
function randStr($length=4,$type="1"){<br>         $array = array(<br>             '1' => '0123456789'、<br>             '2' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',<br>             「3」 => 「0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ」、<br>         );<br>         $string = $array[$type];<br>         $count = strlen($string)-1;<br>         $rand = '';<br>         for ($i = 0; $i < $length; $i++) {<br>             $rand .= $string[mt_rand(0, $count)];<br>         }<br>         $rand を返します;<br>     }